Trinity was the first test of technology for a nuclear weapon. It was conducted by the United States on July 16, 1945, at a location 35 miles (56 km) southeast of Socorro, New Mexico on the White Sands Proving Ground, headquartered near Alamogordo. Trinity was a test of an implosion-design plutonium bomb.
Using the same conceptual design, the Fat Man device was dropped on Nagasaki, Japan, on August 9. The Trinity detonation was equivalent to the explosion of around 20 kilotons of TNT and is usually considered the beginning of the Atomic Age. The creation of nuclear weapons arose out of political and scientific developments of the late 1930s.
The rise of fascist governments in Europe and new discoveries about the nature of atoms converged in the plans of the United States, United Kingdom and Canada to develop powerful weapons using nuclear fission as their primary source of energy. The Manhattan Project, as the Allied effort was called, culminated in the test of a nuclear weapon at what is now called Trinity site in July 1945, and the atomic bombings of Hiroshima and Nagasaki a few weeks later.